record elevation curves of cam mechanisms

Description:

• Cam mechanisms play an important role in the conversion of rotary motion into oscillatory motion.
• The most common application of cam mechanisms is the activation of valves in engines.
• This application is highly dynamic: valves must be opened and closed in very quick succession.
• The contact between the valve and a cam must not be lost, otherwise it would result in uncontrolled oscillations, valve float and possible damage to the engine.
• The GL 112experimental unit allows the dynamic investigation of a cam mechanism at various speeds.
• Four typical cams with corresponding engaging members are compared in terms of their motion behaviour.
• The valve is simulated with a mass and a spring.
• By varying the spring stiffness, spring preload and oscillating mass, it is possible to study the dynamic limits of the respective cams.
• The cam motions and valve raising can be clearly demonstrated using a stroboscope (not included).
• A recorder synchronised with the cam member records the actual elevation curve of the cam mechanism.
• A speed-controlled drive motor with a large flywheel generates a speed as constant as possible.
• The open design means that the motion is clearly visible in every detail.
• A transparent protective cover ensures safe operation.
• The experimental unit is intended for demonstration in engineering education.
• It is not suitable to be used as a test bench in the field of endurance testing/tribology.

Technical Details:

Specification:

• investigation of cam mechanisms
• cam-shaped cam members: tangent cam, hollow cam, 2 circular arm cams with different head radius
• 2 different engaging members: flat receiver with plunger or rolling receiver with plunger
• 3 interchangeable return springs and spring preload
• drive motor with variable speed
• oscillating mass can be increased with 5 additional weights
• mechanical drum recorder with nib and coated paper
• optical speed sensor
• transparent protective cover for safe operation

Technical Data:

• Drive motor
  • DC asynchronous motor with frequency converter
  • power: 250W
  • speed: 60…670min^-1
• Cam-shaped cam member
  • stroke, each: 15mm
  • opening angle, each: 140°
• Spring stiffness
  • hard: 5026N/m
  • medium: 2601N/m
  • soft: 613N/m
• Masses
  • additional weight: 200g
  • plunger: 530g
  • flat receiver: 93g
  • rolling receiver: 20g
• Recorder: toothed belt drive
• 230V, 50Hz, 1 phase
• 230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase
• UL/CSA optional

Dimensions & Weight:

• L x W x H: 800x440x440mm (experimental unit)
• Weight: approx. 40kg
• L x W x H: 360x320x160mm (display and control unit)
• Weight: approx. 5kg

Learning Objectives/Experiments:

• elevation curves in non-matching engaging member
• elevation curve in sprung-engaging member
• determine the limit speed and compare with theory
• influence of moving mass on the motion of cam member/plunger
• influence of return-spring stiffness and preload on the motion of cam member/plunger
• comparison of the elevation curves of different cam-member shapes
• comparison of elevation curves with theory

Scope of Delivery:

• 1 experimental unit
• 1 display and control unit
• 4 cam-shaped cam members
• 2 engaging members
• 3 return springs
• 3 blocks of recorder paper
• 1 set of tools
• 1 set of instructional material

Features:

• record elevation curves of cam mechanisms
• four different cam members, two different engaging members
• influence of spring stiffness and mass on the dynamic behaviour

Accessories:

•  Optional:
• WP 300.09 Laboratory trolley

Due to the continuous development of our products, the goods supplied may vary in detail to that illustrated on this Website.